DOI: 10.1007/s00382-017-3833-4
Scopus记录号: 2-s2.0-85026446867
论文题名: Spatial variation of different rain systems during El Niño and La Niña periods over India and adjoining ocean
作者: Saikranthi K. ; Radhakrishna B. ; Satheesh S.K. ; Rao T.N.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-09-10 起始页码: 3671
结束页码: 3685
语种: 英语
英文关键词: El Niño
; La Niña
; Southwest monsoon
; Spatial structure of rainfall
Scopus关键词: convective system
; El Nino
; La Nina
; monsoon
; precipitation intensity
; rainfall
; spatial variation
; Walker circulation
; Arabian Sea
; Bay of Bengal
; Ganges Basin
; India
; Indian Ocean
; Pakistan
英文摘要: The spatial patterns of rainfall and rain systems during El Niño and La Niña episodes are distinctly different due to the longitudinal variations in the Walker circulation ascent/decent branches over India and adjoining Oceans. In order to examine these differences, 16 years (1998–2013) of Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR) data have been utilized. TRMM-PR delineated precipitating systems (convective, stratiform and shallow) show distinctly different spatial structures over India and adjoining Oceans during El Niño and La Niña episodes. During the El Niño episode, the occurrence of deep systems is high over north of 20°N latitude, and shallow systems are plentiful over south of 20°N latitude. On the other hand, during the La Niña episodes, the occurrence of shallow systems is in excess over Pakistan, central India, northwest Arabian Sea, southwest Indian Ocean and northern Bay of Bengal while the deep systems are abundant over west coast of India, Ganges basin, eastern Indian Ocean and Arabian Sea. The excess convective rain pixels observed during El Niño years are from deep and deep and wide convective core systems due to increase in the CAPE, nevertheless the broad stratiform rain systems are prevalent during La Niña years due to the high convergence of moisture flux and mid-tropospheric upward motion. Though the convective occurrence is more, their intensity is weaker during El Niño years than during La Niña years, indicating the intense nature of convective storms during La Niña episodes. © 2017, Springer-Verlag GmbH Germany.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109323
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Divecha Centre for Climate Change, Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore, 560012, India; Department of Space, National Atmospheric Research Laboratory, Gadanki, 517112, India
Recommended Citation:
Saikranthi K.,Radhakrishna B.,Satheesh S.K.,et al. Spatial variation of different rain systems during El Niño and La Niña periods over India and adjoining ocean[J]. Climate Dynamics,2018-01-01,50(2018-09-10)